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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57c2666c8b58c57a765304c1b550dab7aa33bf25b13fa1fb584ba7e20ac25e0' 
  AND token = 'D3hDVB5aZZBrNY7+aVJ4iNKeWpURAzF44KGF8t3I1Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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