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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1acdcf5ccc1310486b95fbba062ea1b8d61a540d930f70aaa2704bd962e087' 
  AND token = 'pwvwzkYmdidDXEDtX6+G7xkv3E8tlG0aPPhKV2zjZN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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