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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44cda4642e1be5a282fad4f8b1d9c31d234c60b5049cf1319450a5034275b86' 
  AND token = 'Ho1i2qAGe+jyMEcettzOI8veJ0ggekGLZjPSXQFHMSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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