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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfa9a83ed5c7b378d1cfd60186da1c611c8f645e26cdac5445654eb412a30ee' 
  AND token = '2EM7F/mzCrnp7irGRBJrUC3z7txzUiGdbGDhO0mkq6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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