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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd815e3f7262d000b0ae4a6f81d324f09eedc000f2169d531a133bbfe61b87911' 
  AND token = 'O8Qgs8myg6q+IvKVIgTj6ou3YGDomNSMKpBbb875phY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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