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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '750d71fb98c1125af8b5b2c6cc7597db160f225ee08b0cb60de77bcb17ac331e' 
  AND token = '88wH2mBBOa5thsv50jo9hI8A7vjpNeEePPicLquz8Po=' 
  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"
    }
  }
}