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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9559da99d796781b9e0f064de9f2167ac5f05c5fa544f18c99929a64f12b5567' 
  AND token = 'VsiIP4gSIsD8P1ufAs35I0Oj/3i1Om59uCGjUgnB6ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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