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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509f9f5971d59a76c04ba6e87487d2a13b5c6719c53cae9780776711ad6453b3' 
  AND token = 'f3CeUI7CNMb4gGRhXnvO8hBFubKW7u5QKEN+Klj0KUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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