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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ff0695193de48e8a8184b7c7410efd8a2371730a8f62d0fd620a3bfeb3ac3c' 
  AND token = 'xveu9LAMBObigyAri0a8DmR4rzV175/scK6ong8WqXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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