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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90f17e96014a888c1634aea6708ffda8ac4511bdc1e474c917eee4a9f54c5de' 
  AND token = 'ZTx/96Xt6NQsv2eaukXcDSI3I1BHqdbqAw6jM7oUFAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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