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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa10c27d5b3660f29935a893c3f1d29a505ab840d48546e0741fa437af7df58' 
  AND token = '8JqyPAZoPBAr0cztEY7NZ3SLWsyO5NPkNc3SNfUUysg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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