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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc3e3770f6ee756091c47ef76d6a31e7e76d1436348b266089b0cb43f10ee2f' 
  AND token = 'Al3Kvk7K3SBTXLhAgpbQFds6EFrSsKYJlgwyfcziOfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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