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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abd08d16a26a96ac45be958028ac59e3d4bcfd5ec5e30f13e0f736eb1bf1b87' 
  AND token = 'yw8tyuQZ/1rr7KPB5wdwqfjAykgi+dIxdlhVW9gE76w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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