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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a72a2e6a5b01f5e6666fae07ddbff9a52759af618a8a1de291589eb119a18bc' 
  AND token = '/bLZPDImaOzauWqJXTEX5M/B3cGpmpE+r1v/ZP2A7h0=' 
  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"
    }
  }
}