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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00844855265467638acf96264731277721ddee0e96bd3d7421d5cabc0744b4e2' 
  AND token = 'Yzr106iw4VXPkhYjBi0Zhf4oz6A64U4Nis7deyi/dGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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