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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bed13812f8c4d31c48b512fd53a253f8195504b98da362d266c03c4fc53351cc' 
  AND token = 'Fnnkk1BiLlI2pyV/ojtgFSNJHP/B9uGrrclU0Dmdekc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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