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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5479223f5cb90218557f44f075e0ea76fcfea88ab3eb06c4e1a469c42be0cc5b' 
  AND token = 'UxZP1JVgSehob7MzmlcH8W6EdmuTkuxNdZaTvVqn1Rc=' 
  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"
    }
  }
}