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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5a606a4625711a4065c5a20ab6ed9ee92f5f0e5204311877d39807e45df848' 
  AND token = 'QV2GRDqa+OY0Jb0i8od0LnS9p3dKq2iPo1xxTFFY1l0=' 
  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"
    }
  }
}