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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9ea5f33b7218858a7164adc6529f32d1414a36a957dc4d7dd4b4f74389b0d99' 
  AND token = 'TU3ZT2bt6VV2GM2j1tar9u7WubaR1Ha3dufzXi5Y05g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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