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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b8a2a4d63894a7a4225b8333f4f54afdc205239b99c2abf2b762e1a939933d9' 
  AND token = 'OhaIFabkTAexw2vsH282yxztSBihfzhv3FuRB1ClRTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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