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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b6fc54f3864c180569192b007d7abde7a9b3e64d6c225ffb08c73db7d0e5f2' 
  AND token = 'ww9fpBqu4et2oyz4rsdmVWg895rEpMxII4aTSoQ+gxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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