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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd0ae27e2fa98c6bc5163f164d1f1e5f1f29959a71f28219b268680b48beb02' 
  AND token = 'cbbjUr0RTBniO1n00iZ81htXb/PsnsZw84IWyjRwHFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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