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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e877442a85e094d92e37bd5487fa089d92d58913adc74de4de9f0bd80f61a9' 
  AND token = 'wMkfJUDs/HuM2zsfuLtmXZSp2aurXO51PcrWYwCHDpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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