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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75a3dbae3c37d1c7d7606aee2c77b7b0a912e93a6306e34f075675aaf6b16bad' 
  AND token = 'O56VgEjzNaTQe6/vjrUbGdXjkod5aX/LnFBRe281a2o=' 
  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"
    }
  }
}