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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da72ef0b7f1f35966d083ed13320917b66c9488e5c89a3f7ad8cb15b05d1be9' 
  AND token = '+EIiwi0qYDFUtIf9vioIhRNSpI8bBeXEi85gE/rXaL4=' 
  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"
    }
  }
}