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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8caf56266bc3b1b504e98620f8dc53d90e0e63da0f87876fa2fc6f74c66f1be6' 
  AND token = '5/kNsCsC6bq5ycGiEIo+ZicvLekcym+NlYTn9uT2Y+w=' 
  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"
    }
  }
}