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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea29efea232a0cd0348ecb50204946c3d7c357ad485c86f9a1a5250bfd3988ac' 
  AND token = 'nMDlnYiK49s3+Kyt0Tl2KMfl0SOXR7aLQhrf/kop6wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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