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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e5a33a9825dd09605bfd70d8c4b20c4270cb7b0fffd9e01e0195a6f81d52bb' 
  AND token = 'KU8shCDdrGPDDdhbaygXUwNiho3Dnv7IVacncrZXjpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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