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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f301b808ae985846c2a7ef532386aaf1e78fda2ec1e4283c4141400532015d64' 
  AND token = 'JVszta/OvHbWX4uv2u2C3807XAWJKdJGCo+8Mg19+24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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