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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4347f39a566bcdf0a15bb8691f5719c03a1c148e5a9e8ddb64cb793d455ec4a1' 
  AND token = 'r8vPO7GvU3+w2Go3R3vYTX30AMzy20tZlHgdA2JrjrY=' 
  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"
    }
  }
}