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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd9883addab2a869a4aac879f1d9d6b8340e20c4cf2573ef7689210b621b804' 
  AND token = 'y8GmtjDVFIy46I4cLc051wXE3Lz7Khm38pbo99UyWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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