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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2b707124cc50761c39fb5616ab4e6e5f474274c3d820c348f198c7f381ffb8' 
  AND token = 'trTO6P2FBWdC95OvCB2qMXZh0myTJadVI9lIzPi4txk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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