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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f1c3b716fe505c4310ef6813a2591e550667553da86f81b80c0d15e1dd75628' 
  AND token = 'BjTC/C9NsDn7mV1STx1bJgVZUTDuLWVN28KoWZdJjMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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