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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8c61916b737ce35e7f1a13acba48ec5dc5fd623bd0505f48183778781987263' 
  AND token = 'NMQQi+aILQ3Z5kaT237ks+XJiILdnnyjyfMGu9jBx2g=' 
  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"
    }
  }
}