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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ea8162ff542e4cc1e91b8bcb884d8c5e44571848b20955082372d944c6e490' 
  AND token = '18LL8GNg0n26aLo2L3PooWJuYWkudXTonphXJfaXy/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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