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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5e98643088e569e95576f54a48f43e7a067cf7adbbdf6b7538b78f96de7020' 
  AND token = '20XG+zUQQsaSS7O53lxzQ0pIG9yefgxNW6S0EHDDiWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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