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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f9cc44f943fa3ea8715b1d8967a84593d688aacd486d70a927536c9baa782c' 
  AND token = 'r8F5EbZqafU6SHhDwUvDwo2iVepAwm73L4dUgj24z2o=' 
  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"
    }
  }
}