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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a2360df4d1faf97f782627aa0133bd0d7a869383691ea5a5504257e1044629' 
  AND token = 'Ou782VCLq76h2n3jEB4ICOAVoptjxNeQxIHHj4uXtfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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