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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e92baf2bd85d6a38a5b71c083366c5d57ee2f85440c8f6a01af26c3c9e649ea' 
  AND token = 'FXMcE8yvUQuJyDnpWaAO7mmjuDKnZcuPu10p1MTI7wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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