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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b837ee3b22cb014520e52ed10b07ba6dca90ea0b6f31887376bd4409a8f5306' 
  AND token = '5yh8l8HYyNrqQXFc/GpWJXgoD4VFbN0fDCersZPt1Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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