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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f8098562e3237a340ea777c165e17f6b6274b1cd93ca886e05fa921b394709' 
  AND token = 'TV5T4Eff8t0835GrTYLXBGqufBZqL6OSFo6H54a0J5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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