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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c2a26376dd50d1acfb2d135d8d97b362d5a3f1b397f7a2c87bef4f934d7c53a' 
  AND token = '7fVsqiy1/A37m14uKlfXAxBSnsAcEEXS/+G7YSfmZoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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