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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121117314e10ac3bd6c78e027527f439f91ce535a83048910bb219969ee90f6d' 
  AND token = 'X0riXnojm72CKl2H1n/GxoLcEAPXb07OkEQCzojxowU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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