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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4063bfe09a9a82fc859f4bcc733a5b0d267525a94c49705b0f28520c5976ab0a' 
  AND token = 'rxy2pH0ktZiYyBevcAPq0Eu8TGU5ZH570fU0FZOZVAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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