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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d83839c7b9e47a75e487cf81b76812e8861dcefe78e0529957afa57386febec' 
  AND token = 's46CW6JiM1uy3IFBV6y1hHAErKuFv5TiSDEemv8Pviw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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