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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02e59eaceb988c979d3a0fa3cf2f3934a672f930586164706423d27f09b78086' 
  AND token = '+YQ12uQIyML0kUmqjimfB3td0Qw1V+HC7vTh66ufLfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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