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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a27fe4584886dd73c3204a7811d1ecd0f044eb3e6b1da6e22f9a7514634b22' 
  AND token = 'kuHNU0hxNwQL94H7q5CwypeYpLkxX9s42ViPQ+H6PZI=' 
  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"
    }
  }
}