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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3b1c3e75e54f61bdf62be832a961897541bcf4ef161c708f55160850f7fca4' 
  AND token = 'Ldn0tMscLljA4Z+v3+E9Uc5ei0/sXnuSlAMU182tyZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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