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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1daefc1907a2236ba7ae9427a29da672c3ac3f92239f58a8cd2673cac099304' 
  AND token = 'i8J5Fxr2bL7hB+2BAYlp1osKgrArMpzFA5gBk/aPHts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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