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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b4f774568e5fb1c248368c56eff674021d361ac30ec48b0da259aa12b8b663' 
  AND token = '+YSAI0Sfb+1oRbcx1byTQXMZZtbKPYvfEu1vWpaOs2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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