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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf37b02c12e082cb3c7f42e024abdb82ea53b33506118b51325e594a5ff4e2f0' 
  AND token = 'wUoRAi2igDOvUWEUDFgg2o9pmLITxNhbi7TG241B4eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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