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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ac8521f86a7a40f871e5b8b28522e71fb44b036303511cb46590a1ae8e5320' 
  AND token = 'mP7E08h0hAimnakGjX/1iD2QoSOFDLCHuzYJ9Zj7mU8=' 
  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"
    }
  }
}