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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8decf28a5971094a4cc48a4b9d6fa15d684a7786e7606bacb7cc0d9dde4be60' 
  AND token = 'WffCs1LOJ3s5iH5yLdNRp++OELEMFg6xUQiGa57su3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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