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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba9d8e6cb9c6e6a2fae4ca10bc9a3ce077c4ab9cc87f1262a3df506c6f16785' 
  AND token = 'bdi09xOMVKzXzOz1qNs/Y0wI8UPL6JVBDUb6S0vkgko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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