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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cd95d8a7fcd95d9b91173a7267632f3604c6fc72997a4a61f4fbc0879409a0' 
  AND token = 'Rkc6Ntvx29FhD+7LPfHeetTVgbqdbcA7FKbx3tvzCgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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