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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '848bcc830390be7a3384bd53f714f6e3c5111b77806c60a1065f1235268a030d' 
  AND token = 'yji28CJBLWJ1rVlHCAXNwfnkc+QXU5nstcbzVCvs9Bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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