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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057c9e7152a24173b5a8f0b7d6597d6811994a39239e9e5462d5fa3378903153' 
  AND token = 'KFC5Tnzares4eQo+3W/oLjn9/uJD0b1qZ7lTsT27MzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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