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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6eb611d94fb80b6dcef7fb95974ea29b9487693f4d4ffab5d06f03ec55b843' 
  AND token = 'MNlLGrx3xz9k1tbzFwerZxWl5ls/KQiBO5pNUO61MQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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