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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf6a21c9f4a597f4d9309c032a5cec89666cf85855ce78366cf99a9c94fbb80' 
  AND token = 'kM+sucMpARC6Sa/saESrE9Vl+XtvUI0A2GvGlxn1hCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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