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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1972594ff84921239bd71ff0a41ba344d50c7cac4dd400acef235277355bb5be' 
  AND token = 'VD3sohJe5ej7i7N2/tT35b0VsKDotuNSbN9gHgQ4jy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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