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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd183228ee7fa50c14818416bb15c808482d29f689688f27d21d2b7b10dfe789a' 
  AND token = 'Ts6R4ZHp0KskDluocNyNBMTGKefofWyM7cB04SDi6kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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