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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6a30368b51f4e9c9ce8ed0f91369ac8df57dc89a1ec5720f02e8e14476fd2c' 
  AND token = 'HGL+hcGnXonNlHm69415OypvLe1ZItCTd5K3Ott5218=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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