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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e47b055451092d817eb62d3b097247d931ebb868dddba27a6bd038ad929f0db' 
  AND token = 'c+vYdrBbDWhNIL6D/i7s7QPC531vtzA9RI53oaUG1x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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