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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f519f46733b54b2f24988643da669e5e8b2e1e1bbe2745120fb889bf22671b4' 
  AND token = 'vF25UEb4D162+Hn3YKo/rLwOZ2aOym8g8XfrkXzist4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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