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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9f0b5925bc6b21aedf16c53a23bdf0fe6e344f6ef6a74c1b284637b453946d6' 
  AND token = '55KmMQyVM8sEpy9lJH+/H4zScLUkS/amNpb4cfmDFEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}