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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8f907efa00bf55334ce8e07bccbfe23661fbbd556658f93d1a13f293dd45a9' 
  AND token = 'ixPlvs6DA516qUUMLmqOpuGgzascx7H5TyqgleY5s3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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