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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb5bc48abc1ce1f9b323a6668d7c8fba07436c5560e9aa36dc270adc2c8d905' 
  AND token = 'E/d2Cgbsi4jSFNi2mUFvd5etriTt4epKVfHpU73lwMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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