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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa295a1fd3a9b9a3aff3b0591354c0a1cacefdb77c8722531531c9c5800baa04' 
  AND token = 'wK0ZknbshroV7ZtpSX9Th4z20PDMUOsW1gKPc48Iyck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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