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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b3c9dbf56114d983c01a02c04e6fefa6e32bbda6fcc620a5cf8e7bb537b285b' 
  AND token = 'VPCQWs19s4CoarPwIp1OFTFJlxTnKHgb3xkx5qn/OIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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