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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa9c03597d59b041e44ecd2f3c79c5f3f2b41818a9b82baed2007af1c096a2e' 
  AND token = 'lsOWsXiYdM26F+EhF/sX7bad6/wz9/gB+6dFeUGD9Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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