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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e91d25ff2bf225f3350aa55013b9dd1f52c009c82b5ef76f7d5b278f4f3aeb' 
  AND token = 'NFxx47oySQ0VaR7XvO03pvUQRv0ln25gc8jGjik8/V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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